Abstract
In order to convert elliptical Gaussian laser beam to circle flat-top beam,a two-mirror unobscured reflective optical system is designed.Based on the energy conservation law,the Flattened Lorentzian function is chosen as the distribution expression of the output flat-top beam to build the relationship between the input and output aperture coordinates.The equations in integral form that describe the reflective surfaces of the shaping system are derived by applying the law of reflection expressed in vector.Through the numerical calculation of the surface data and optical design software simulation,the circle flat-top collimated output beam is achieved and the illumination uniformity of the target area is above 95%.It indicates that the shaping system could improve the flatten degree of the elliptical Gaussian laser beam apparently.
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